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At what temperature does the water have the highest density?

0°C (32°F)
100°C (212°F)
-273°C (-459.4°F)
4°C (39.2°F)
Increasing the temperature generally decreases the density, but water is a notable exception: the density of water increases between its melting point at 0 °C and 4 °C. Similar behavior is observed in silicon at low temperatures.
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Answers by country

0°C (32°F)
100°C (212°F)
-273°C (-459.4°F)
4°C (39.2°F)
answers
flagEstonia
0%
0%
0%
100%
11
flagGhana
8%
0%
0%
91%
12
flagSingapore
0%
10%
10%
80%
10
flagMalaysia
8%
8%
0%
75%
12
flagthe United States
13%
7%
10%
68%
138
flagIndia
14%
7%
11%
65%
188
flagAustria
7%
8%
21%
63%
57
flagCanada
7%
15%
15%
61%
13
flagPakistan
21%
4%
13%
60%
23
flagGreece
20%
6%
13%
60%
15
flagSwitzerland
14%
7%
19%
59%
42
flagthe Netherlands
17%
17%
5%
58%
17
flagAustralia
18%
6%
12%
56%
32
flagGermany
16%
10%
20%
52%
376
flagNigeria
40%
0%
20%
40%
10
flagPoland
29%
13%
20%
36%
6703
flagthe United Kingdom
34%
7%
26%
31%
76
flagRepublic of Ireland
38%
23%
7%
30%
13

What sound can be heard when approaching an iceberg?

a cracking noise
a fizz
a roar
a whisper

Where is the saltiest lake in the world?

in Antarctica
In Australia
in Israel
in Turkmenistan

At what temperature does water boil at the top of Mt Everest?

68°C (154.4°F)
101,4°C (213,8°F)
100°C (212°F)
98,6°C (208,4°F)

What ions are formed during self-ionization of water?

H₃O + and OH-
HO₂- and H₂O
OH + and H₃O-
All answers are correct